#!/usr/bin/env bash
#
# brew-release.sh [version]
#
# Release tt to the self-hosted Homebrew tap — no GitHub. Archives the tag
# straight from the server's bare repo into a source tarball under /dl, then
# writes/updates the source-build formula in the `homebrew-tap` repo and pushes.
#
#   scripts/brew-release.sh v0.1.0
#
# Prereqs: the tag exists in the `tt` repo on the server; deploy/deploy.env is
# filled (REMOTE, DOMAIN, REPOS_PATH, RUN_USER); the `homebrew-tap` repo exists
# on the server. Users then:
#   brew tap humdrum/tap https://DOMAIN/git/homebrew-tap.git && brew install tt
set -euo pipefail
cd "$(dirname "$0")/.."

REPO="tt"
PKG="./cmd/ticktock"
VERSION="${1:?usage: brew-release.sh <version>}"
VER="${VERSION#v}" # strip leading v for tarball/version string

[ -f deploy/deploy.env ] || { echo "missing deploy/deploy.env (see deploy/deploy.env.example)" >&2; exit 1; }
set -a; . deploy/deploy.env; set +a
: "${REMOTE:?}"; : "${DOMAIN:?}"; : "${REPOS_PATH:?}"; : "${RUN_USER:?}"

TARBALL="${REPO}-${VER}.tar.gz"
URL="https://${DOMAIN}/dl/${TARBALL}"
HOMEPAGE="https://${DOMAIN}/r/${REPO}"
CLASS="Tt"
DESC="Charm-native front-end for the tock time tracker"

echo "==> archiving ${REPO}@${VERSION} from the server"
# Run as the repo owner so git doesn't reject "dubious ownership".
ssh "$REMOTE" "sudo -u ${RUN_USER} git -C '${REPOS_PATH}/${REPO}.git' archive --format=tar.gz --prefix='${REPO}-${VER}/' '${VERSION}'" > "/tmp/${TARBALL}"
SHA="$(shasum -a 256 "/tmp/${TARBALL}" | awk '{print $1}')"
echo "    ${TARBALL}  sha256=${SHA}"

echo "==> publishing tarball to /dl"
ssh "$REMOTE" "install -d -o caddy -g caddy /var/lib/custard/dl"
scp -q "/tmp/${TARBALL}" "$REMOTE:/var/lib/custard/dl/${TARBALL}"

echo "==> updating the tap formula"
TAP="$(mktemp -d)"
git clone -q "soft:homebrew-tap" "$TAP"
mkdir -p "$TAP/Formula"
cat > "$TAP/Formula/${REPO}.rb" <<EOF
# Generated by tt brew-release.sh — do not edit by hand.
class ${CLASS} < Formula
  desc "${DESC}"
  homepage "${HOMEPAGE}"
  url "${URL}"
  sha256 "${SHA}"
  license "AGPL-3.0-or-later"

  depends_on "go" => :build

  def install
    system "go", "build", *std_go_args(ldflags: "-s -w -X main.version=#{version}"), "${PKG}"
  end

  test do
    assert_path_exists bin/"${REPO}"
  end
end
EOF
git -C "$TAP" add "Formula/${REPO}.rb"
git -C "$TAP" -c user.name="tt" -c user.email="tt@${DOMAIN}" \
  commit -q -m "${REPO} ${VERSION}"
git -C "$TAP" push -q origin HEAD
rm -rf "$TAP"

echo "==> done"
echo "    brew tap humdrum/tap https://${DOMAIN}/git/homebrew-tap.git"
echo "    brew trust humdrum/tap"
echo "    brew install ${REPO}"